Hi, I'm fairly new to geocaching and wondered if any of you could help me with trackable etiquette.
Recently I have found a few caches which list trackables on the inventory, but the trackable isn't in the cache. I try to take a photo of the cache contents and write on my log entry that the trackable wasn't there. Should I contact the owner of the trackable, or do they get a notification when the cache is visited?

Also, with regard to travel bug hotels, is "the done thing" to swap one trackable for another? Do I just pick up the trackable I like the look of, or should I pick up the one which has been in the cache the longest?

Would be grateful for any advice.....