Originally Posted by
HouseDragon
Once burned, twice shy!
I was thankful that I always mark every tool, etc., I take to quilt classes. The person next to me asked to borrow one of my rulers: when we were packing up several hours later, my ruler was nowhere to be found. I asked her to return it and she immediately said it was hers! 
I pointed out that my name was on the ruler.
She reluctantly returned it.
I would have been so embarrassed if I had inadvertently picked up someone else's ruler - and would have been apologizing all over the place.
I wonder if those address labels - with a phone number added to it - would be a good thing to put on everything - so if something was left behind, the finder would be able to return it? Or at least ask - - - one might be willing to let them keep it - - - - maybe - - -
It might also be a good idea to have a check list of things brought along - to make sure one packed everything up when ready to leave.