Know your inventory?

I had found an item listed online as a signed Venini 'a Canne' vase from the 1960's several weeks ago, and found it again just the other day. The photos showed the mark but was difficult to read, and the type of mark shown suggested the item was not a 60's piece, but I couldn't be positive without inspecting the item. Since I was going into that area for the day I decided to stop at this particular shop. I arrived there and the shop keeper buzzed me in, and greeted me. I told her what I was looking for and that the piece was listed on their website. She said to go ahead and look around, while she located the piece in inventory, as many of those are located in the on-site storage area (ie. basement).
She came back with a piece I hadn't seen on the website, and told her that wasn't it. We looked at the site together and I pointed out the piece I wanted to see, she again had to go to on-site storage. I checked out the piece she had brought up while I waited, this piece, while nice,  was not signed (or priced) and not what I wanted. I also looked around the shop at the other items of glass offered. After a few minutes, she returned without the piece, it was not where she thought it might be, so proceeded to check other cabinets in the shop, and text (yes, text) her partner to see where the piece might be stored.

After about 10 or 15 minutes of looking in various cabinets in the shop, and almost every piece of glass in the shop, I did find another piece I liked, but it was not priced (again) so she needed to look that up in inventory too, but it too was not in the inventory list, so another call (voicemail this time) to the partner on this item. The shop keeper mentioned that the partner likes to move things to and from her country house, so it "makes for an interesting method of inventory management". I decided to leave my number and they could call when they've located the items and information.

About 15 to 20 minutes after I left the shop I received a phone call from the girl in the shop. She had spoken to her partner. I was told that the partner had taken the first piece home, "to do a little more research on the piece", so it was still available. I was also told that based on the further research, the piece was not from the 1960's (as the website states), but from 1993, a difference of 33 years. Although I would have expected a price reduction as the piece is now "newer" , the price of course remained the same. A piece from 1960 and that from 1993 are vastly different in value and pricing.

There are a few issues which irk me in the scenario above; the first is the lack of knowledge on the part of the dealer. This shop mainly sells pottery and glass from the 1950's through the 1970's, and Venini from the 1980's on are clearly marked with a year; how did they not know the piece was from 1993? The fact that they put the item up on the website with incorrect information, and not changing it once that information was known. The moving inventory; I feel I have the reasonable expectation, when a shop has a physical location listed on a website, that the piece I am interested in will be available for inspection at that location, not at some offsite storage location (or the partners home) for the duration of it's listing. If it is stored offsite, that information should be available, and that would allow one to call ahead to see if the item can be inspected.

I have since re-checked the website, and unfortunately, the information that it is a 1960's vase has not changed, but inspecting the photo of the vase bottom again does show a date of 93, when one intently inspects the mark.