When I get an acorn tip, I often just smile, it's like a thumbs-up tip for me so I often don't mention or thank the giver, my bad. Most of the time I give them back, with a few extras thrown in because I already have a mountain of them and I tell the sender to use them for themselves for badges or raffles or give them to other members.
Joan needs a few badges, too much blank real estate up there!