>>127460121
3 guitars in your bag would get you pulled over to secondary, then you'd get dinged for smuggling/tax evasion, or working without a proper visa. A suitcase full of used clothes doesn't trigger the same scrutiny.
Taking the neck off of one guitar, and packing it in your suitcase however is the smart way to travel, especially since Fender Japan only gives you a shitty dustcover.