I have always felt that taking a downmarket type suitcase and leaving it unlocked was the best policy
When I joined BOAC every crew member used a navy blue Globetrotter, probably because Uniform Stores sold ( didn't give ) them at a slightly lower price than Selfridges, or John Lewis if memory serves.
Trouble was, everyone had a numbered key, a pathetic thing, but gave one some sense of security because it was numbered - Oh yeah ? Every key was numbered 3 !!
When lost the stewardesses hairpin served just as well - much better if she actually came along to ones' room to assist, rather than just hand over a pin ! ( one has ones' dreams and memories )