I went to a bed bug training from our Health Dept as I'm a social worker & used to be in homes quite a bit. They say to leave luggage in hallways (if you fear theft have someone stay with bags), then peel away sheet around mattress & look around edge & between the mattress & box spring especially near the walls, if there's a head board you will see them behind head board. They seem to come out in the darkness of the night, so during the day they they're in the crevices.
You can pretty much see bed bugs anywhere now due to our transportation filled society. So where luggage can pile up there can be lots of transfer of bugs, like luggage storage in an airplane, train, bus or even trunk of a car.
Example, you stay in a hotel night before flight, there bed bugs in hotel, you don't realize this. Next am you pack up belongings head to plane with new bugs in tow, your luggage sits for hours with everyone else's & now bugs have spread. Joe Blow who did not stay at a hotel has a bag that sat next to your bag in the cargo of the plane now has the bugs too & he heads over to POP, store his bag with bell services & now his bag is waiting with other POP guests spreading the bed bugs, etc. Its really never ending. Its not Disneys fault, it just happens.
Plus these bugs multiply & are so hard to get rid of. They told us at the training that if they're in your room, potentially they're in the rooms on either side of you, plus those above & below you. So even if they're not seen at least 9 rooms potentially should be exterminated depending on what floor the room is on.