Never have. One of those things I just never thought to do. I did tip my movers when we moved our entire house. Not sure about furniture or appliance delivery. Thankfully I don’t have any deliveries expected in the near future.
I am of the opinion that tipping is over expected these days. Doesn’t anyone get paid properly for doing their job? The one place I do tip well and am happy to do so is the restaurant. Those people live on tips and I’ve been even doing more because I view them as being on the front lines of this pandemic.