We have had this happen a few times-- everything from lingerie to adult toys left behind. Any good verbiage that you can share?
I usually say "Thanks for staying with us. You left some items behind. Let me know if you would like us to get them back to you and we can work out mailing them." If the guest says "I didn't notice anything missing. What was it you found?" that is where I want to make sure I don't make anyone embarrassed or uncomfortable.
What is the best way to approach? Blunt and factual? Euphemistic?