Firearms and ammunition only.
If this happens to you (service in person, at least, you might get lucky if they serve you by mail and don't show up to take the guns right away) there will be no "ahead of time." It will be "Mr. Jim, we are here to serve an Interim ERPO on you. Surrender your guns now."
Thanks for relaying your experience in the field on this. This is going to be a shitshow for everyone, but I feel for the cop who is told "This guy is dangerous and has guns. Now go take them all away because he said something scary this one time."
They are not liable. As Mark pointed out, the law only says how they "should" be transported (if cases are available) and that they may not be marked. It doesn't say anything about where they will be stored, what condition they must be kept or returned in, none of it.
sounds like a person in that position should tell whomever would be in possession of said firearms should make a call and make it clear that if anything ever happened that said firearms were a gift to the person in possession, one second before said event occurred.
and md sucks.