Crooks are everywhere, but if you have a reputable forester and a reputable logger, you will be fine.
Just swing by while they are there often enough to keep tabs on things, but not so much as to be underfoot and everyone will be happy. Just don't be a moron and waltz out into the cut while they are working, wait at the landing in a reasonably safe spot... rule of thumb don't go past the fallers trucks... as they're probably not going to smash their own trucks.... they may not know where your's is though...
Whatever happens you should get at least some paperwork from the mills showing gross board footage, net board footage and of course money for trucking etc, Granted east coast may do things differently, but the mill should provide something to someone, even if its not you, you should be able to get your paws on it and keep tabs of what is actually going on.
It would also be wise to request a trucking ticket for every truck that leaves loaded, that should include destination and ownerships.
Note; I run a self loader log truck, I haul for every sort of logger there is, most are honest, many don't have a damned clue, I always at least try to leave a load ticket unless no one is around, or they don't care to have em, even then if they are around I make sure they get one. Its reallllllly easy to steal wood in a self loader, so I do my part to remain accountable as best I can.