The wood was not cut properly. Technically the permit requires you to partially cut 'logs' (even just 6 footers) in a manner where they can't be used as posts.
I ran afoul of this a couple of years ago. The feds were doing some thinning on ground that ajoined ours.
Every day I'd see these nice cedar poles all stacked for burning, eight footers, ten footers, whatever. Being in the used cow business I can always use cedar fence posts and these were prime.
I checked with the local office and they gave me a firewood permit for the area....said I could take all the cedar I wanted off of the burn piles as long as I didn't make a mess.
Saturday comes and at daylight I'm bucking cedar poles into eight footers and throwing them in the back of the pickup. Just about had a load on when the FS gal showed up. She told me, and was most adamant, that taking eight footers was a violation of the permit...I had to make them short enough that they couldn't be used for any other purpose than firewood. Big argument then commenced.
I told her I'd buck them up when I got them home. I tagged the load, tied it down and drove off with her still jawing at me. I watched for the flashing blue lights in my mirror all the way home but nothing happened.
Was I technically in violation of my firewood permit? Probably. But there was nothing on the permit that said I couldn't take my firewood in any length I wanted.
Was the FS gal just doing her job? Of course she was. And I met up with her later and apologized for my behavior. She also apologized for her's. But...she could have exercised a little common sense in the matter and the FS could have been more instructive on the terms of the permit.