The "Valet" screen on the 2.5 VDS shows you if there were any (how many) truck openings during the Valet period. It's pretty easy also to ask the Valet why he/she opened the trunk if the screen tells you it's been opened.
Mark, you said the OVMS could do anything the VDS does. So I figured that when the VDS updates the valet screen by indicating a trunk open or glove box open, it could also send the owner a notification of such.
And Nigel: It would be simple enough to ask when I get the car back, but it's my experience that the guy who parks it is not the guy who gets it, and the guy who gets it doesn't know who parked it. If the trunk is opened right after you drop it off, you could come right out and say, "you know that electric sports car that was just parked, someone opened the trunk, please bring it back so I can inspect it." At that point they should still remember who put it away, because he'll probably still be holding the key. I know I am coming off as paranoid, because I, personally, have not had any problems with this car or my last car. But I've had 2 Lexus sedans. Problem is they have a lot of in-cabin storage. I didn't notice something was missing until I needed it again (usually sunglasses). Luckily, the Tesla seems to be a "good karma" car, and the valets have been very nice to my car... but there's always one asshole, and I'll be ready for him when I get that text!!! (once Mark gets that feature going)
By the way, one feature I have used already and has justified the price is the remote valet mode setting...
Pre-OVMS: I pull up to valet. A guy rushes up to open the door. I tell him to hold on. I put on the emergency brake, and wait for the VDS to update. Then I plug in the code, covering it up so the valet doesn't see. Then I get out. "Awkward!"
Post-OVMS: I pull up to valet. A guy rushes up to open the door. I get out (wow, just like a regular car). Then while walking away, I make a few taps on my iPhone et voila.
I use valet a lot in Houston. To give you an idea of just how easy and good valet is here. This morning, I brought my daughter to the Galleria mall. Valet was $6. I thought to myself, "No need to valet, that's a luxury, I'll just self park" When I paid for self-parking, it was $11. My Tesla is low enough to drive under the automatic gate, I just should have out of principle... but I paid it.
In any case, I like the valet mode feature.