i have sold through all my Ewok Villages Minecraft Villages, GE, Town hall haunted house in last year. all FBA. knock on wood i have had zero scams on any of these large high value sets. i wouldn't even think about selling any large sets FBM because i'm a lazy pos and i like to get top fba dollar. plus every amazon scam begins with selling fbm. only stupid or desperate scammers are going to try and scam an expensive package that has been verfiably shipped out of an amazon warehouse.
in my experience, if you are going to sell large sets fba, you have to imagine yourself as the customer and cater to that experience. u spend a ton of dough for an overpriced lego, you don't want a mangled smooshed box.
at a minimum, you have to pre-package the set in its own separate new clean properly sized outer box to ensure that it doesn't get crushed by aggressive shipping personnel. and so that if it does gets sent back to FBA, its well protected.
this requires more work and labeling and shipping material cost which you will make up on the back end by making sure to price higher than the fbm'ers to collect that premium. i put fba stickers on the set in the box and also on the outer box i send it in just in case returning customer sends it back without my perfectly set up protective outer box. i have not lost any sets to returns doing this. i have had 3 returns in the last 6 months selling large fba and all 3 were resellable w/o me having them recalled. unlike vast majority of sub $80 set returns which are just outright minifigure rip offs. maybe i'm just lucky or lazy and lucky. it's working. most people buying big sets on amazon fba are not scammers but people who believe that fba prime tagged products are somehow more legit or superior than those 3p fbm. i know its crap. thats just how people think. if its prime it must be better. at least that's what we are told to chant at the underground Jeff fan club meetings.