@Bene330 If the guests denied having more than 5 people in their group, and your only evidence to the contrary is that they used more beds, Airbnb has no basis to collect an additional fee from the guests. This is the kind of thing you really have to catch while the stay is still in progress - and back it up with a House Rule that only the registered and paid guests are permitted on the property. That way, as @Sarah977 notes above, your guest is left with the choice to either accept your alteration request with the correct head count and fees, or face eviction on the grounds of violating the agreed rules.
I see no reason why condoms wouldn't be used during a work trip - it's not unheard of for human beings to have sex after work (or even during, depending on the job). Anyway, it is an option to lock away a bedroom when you have more bedrooms than paid guests, as long as this is disclosed in the listing.
You might have gotten a better result on your claim if it had been very narrowly focused on the actual breakages. However, claims for broken locks and latches tend to be unsuccessful, as those things commonly fail to no fault of the user. At this point, I think I'd take all that time that could be spent resurrecting a dead claim, and redirect it toward updating those House Rules and developing a plan to enforce them.
