This is from an established puffball that 'flowers' near a neighbours barn every few years. They were happy for me to take the dried up fruit. I'm planning to spread some around my tree field (and possibly the unoccupied land next door) If anyone else would like some - shout out and pm me a snail mail adress and I'll cut you a slice and post it.
Anyone outside the UK is unlikely to have it arrive, but I'm happy to post it if you want.