NES--Most--if not all--of the Tanooki/Hammer suits in the first red/brown or blue mushroom houses(depending on which of the houses you see first on the map) in each world are in the first box. Second and additional houses have a different location and maybe the same box every time, too. I don't know if every cartridge is exactly like this or not, but it probably denotes a pattern that allows you to collect a lot of goodies. So, if it is not your first box for you, it's probably the same box in your cartridge. The orange/golden houses appear to be far more random, but Frog suits appear to be really easy to get in most of the houses that have them. It can be like "stealing"; I have gotten to the point that I hate Mushrooms and feel indifferent about Fiery Flowers.
SNES(...All-Stars)--Most--if not all--of the Tanooki/Hammer suits are in the middle box of those same first houses. Again, everything follows the same pattern.