Hello everybody
I'm new to this site so please forgive me (and tell me) if I'm not supposed to be asking this.
Today I was in an antique mall and found a big lock box, the back row of which was full of what looked to be katana:
I had the box unlocked and had a look. Most of the swords were shiny, heavy (to me), and quite sharp. They were all priced at between $300-$450.
When I got home I did some research and realized that many of these must be fakes. Some were sharpened up to the habaki, and I can't remember any of the ones I looked at having obvious hamon. Some were very obviously "acid etched". But there were one or two in there that were a tarnished grey. I also did not check all of them for how far up the blade they'd been sharpened as I hadn't known to look for that until I got home.
In any case, I'd like to go back tomorrow and have a closer look. Bringing a magnet to make sure none are aluminum and a magnifying glass for use with any that might have a hamon (I didn't look at every blade). But I was hoping someone here could offer some advice on things I could look at to make sure I'm getting an as-close-to-real-as-possible katana. Assuming I even buy one.
Are there any tests that I can do there in the store? Can I test balance in the sheath? Besides the things that I've mentioned (sharpening, level of tarnish, presence of hamon) is there anything else I can look for? I am not going to be taking any blades apart to find signatures, not comfortable with that.
FYI I do not intend to use the sword. I'm simply interested in owning a sword that was made in Japan if possible, though I know that any "real" katana will be much more expensive.
Any advice is appreciated. Thank you!

I'm new to this site so please forgive me (and tell me) if I'm not supposed to be asking this.
Today I was in an antique mall and found a big lock box, the back row of which was full of what looked to be katana:

I had the box unlocked and had a look. Most of the swords were shiny, heavy (to me), and quite sharp. They were all priced at between $300-$450.
When I got home I did some research and realized that many of these must be fakes. Some were sharpened up to the habaki, and I can't remember any of the ones I looked at having obvious hamon. Some were very obviously "acid etched". But there were one or two in there that were a tarnished grey. I also did not check all of them for how far up the blade they'd been sharpened as I hadn't known to look for that until I got home.
In any case, I'd like to go back tomorrow and have a closer look. Bringing a magnet to make sure none are aluminum and a magnifying glass for use with any that might have a hamon (I didn't look at every blade). But I was hoping someone here could offer some advice on things I could look at to make sure I'm getting an as-close-to-real-as-possible katana. Assuming I even buy one.
Are there any tests that I can do there in the store? Can I test balance in the sheath? Besides the things that I've mentioned (sharpening, level of tarnish, presence of hamon) is there anything else I can look for? I am not going to be taking any blades apart to find signatures, not comfortable with that.
FYI I do not intend to use the sword. I'm simply interested in owning a sword that was made in Japan if possible, though I know that any "real" katana will be much more expensive.
Any advice is appreciated. Thank you!