Re: Bin (Dumpster) Diving
That's a terrible pun...... but I like it.
As one of the previous commentards have said, you would probably get more radiation exposure from an old watch than these samples. Everything always get's blown up (sorry about that) by media hype with these things.
Regardless of all this, leaving anything of value (especially radioactive sources perhaps) in a car in a hotel car-park is perhaps a bit foolhardy.