Nos as such, but when I was framing new homes, I would always nail a new penny to one of the studs, and sign my name next to it. Then when I started doing remodel work I kept finding beer cans in the walls. I always made sure to keep one for myself, and to leave a new one in the wall with the old ones, also signing my name to the stud next to it......
Also, an oops moment, I set a bag of taco bell food on a ledge, and when I came back at the end of the day for my leftovers, the sheetrockers had sealed it up into the wall...... I'm not sure what a nacho bell grande will be worth in the future, but I'd hate to open that wall up........