what were the elven caravans bringing the years that the diplomat was also asking for lumber restrictions?
My fort started out with a craftsdwarf being in charge of "dealing with" this serious problem of way too much mudstone. So, I've always had crafts coming completely out the wazzu. As time has passed, I've added leather goods (quivers, backpacks, boots, cloaks, waterskins only), then both rope reed and pig tail weaving kicked in.
But... I didn't focus on bribing and overpaying everyone initially. I was busy surviving the waves of goblinite riding beak dogs.
It took like ten years for the elves to get ticked off enough to send a diplomat - I hadn't really been too worried about the pansies, I'd just been making consuming the wood I cut pretty well.
I made the wood cutting treaty for like five years straight. A couple years I checked the civilization menu - on one I had "-1300" on my wood allowance. So... I wasn't really very good at following the treaty restrictions. But I did start bribing the snot out of them. The poncy elf would just appear again next year and make a new treaty. This is where I started reading up and trying to figure out what I could do exactly. So here I kicked off my "Cut all you like, but no wood in spring" policy. Then he made a bad choice of where to appear.
I never saw any real difference in my elf caravans all the way up until I started breaking treaties yearly. It's possible they even skipped a year or two. I dunno.
But the caravans during all the non-pissed-off years still weren't that exciting. logs, cloth, plants, the occasional seed.
I don't remember -ever- seeing an animal. It is quite possible I've overlooked cages of dog/cat/mule/cow, etc. as too normal to care about.
I really can't say what, precisely, they were bringing in the trade restriction years. It sucked. But the elven caravans most always suck - so that doesn't limit things much.
After the death of the diplomat, the caravans -seem- to have improved. Slightly. I can't decide if I'm on the path to animals-from-elves or not. And it has been at least four years since the diplomat's death of zero-lumber-in-spring + overpay-and-massive-bribes.