I've experienced people wanting me to dump my finds to pick through and claim things. It can be extremely uncomfortable, and often disappointing, so I don't do it.
I've had someone pocket my finds after agreeing to let me keep them, too. The time that stands out was when I was young - it was a good handful of change - less than a dollar, but it took the wind out of my sails.
Giving up some gold rings for unlimited exclusive access to a place that produces good finds for years? That works. Giving a homeowner something relevant to the home or family's history? Also works.
Agree, it can be uncomfortable and disappointing to dump your finds, but if that was the deal, that was the deal.
If it wasn't, choose to comply or deny the request, but be prepared to accept the response.
My feelings are that if a deal is made, all parties are obligated to comply.
If a party tries to make a change, accept or deny and move on.
I would never hide finds in a special pocket, show only junk, whatever, but that is how i am.
If i ask a farmer for permission on a cornfield and he happens to ask what i'm looking for, i say anything metal and any arrowheads i might come across...
Go ahead. Watch out though, ill be spraying !!!! out there every day this week.....
Hunt a yard? They ask to see what i found? I show it all.
Was there a deal made beforehand about keeping finds?
I would keep it.
No deal beforehand?
Choose your battles wisely.
Some property owners are generous in their permission.
Some seem like they are but turn out to be a$$holes.
Just an aspect of hunting private property.