There's not a problem with CAP for some stuff. I think if you ask for a replacement, you'll likely get a better one, though you'll likely just need to return it and get a new one. Is there a reason you're going with a 1" bar? If you've got a bunch of weight plates, then I can understand it, but if you don't have much weight, you'll be much better served going with an Olympic bar (depending on your goals).
If you'd like some general guidance, then this community would love to help you out. As far as this particular need, I don't have a better suggestion than running a return and getting a new cap bar (or maybe this one).
You could also check Facebook marketplace or Craigslist for a good used one.
Good luck and fire away with any questions you might have.
I think you may run into an issue fitting your plates on a 28.5mm shaft. I believe most standard barbells are just under 1" while these are 1.1". This one says it is rated 700 lbs. BalanceFrom Olympic Barbell Standard Weightlifting Barbell https://www.amazon.com/dp/B088CVGQ6N/ref=cm_sw_r_cp_apan_glt_fabc_M06AYJC9DBXBFXJS7EN8?psc=1
Since you already have the plates you could just buy a 7 foot bar.
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Also nice find.
Second that, here seems to be a decent 1" 7ft bar:
This one says it has a 700 lb capacity, it's Amazon so like you said could be inaccurate. https://www.amazon.com/dp/B088CVGQ6N/ref=cm_sw_r_cp_apan_glt_fabc_M06AYJC9DBXBFXJS7EN8?th=1
100$ for this one with a 700lb limit
Sporzon! Olympic Barbell Standard Weightlifting Barbell https://www.amazon.com/dp/B088CVGQ6N/ref=cm_sw_r_cp_api_glt_fabc_58R5HN97206AWEFH62AJ
Does Mirafit ship to the US?
https://www.amazon.com/Sporzon-Olympic-Weightlifting-Barbell-Capacity/dp/B088CVGQ6N?th=1
Sporzon makes cheap Olympic stuff - and by the looks of it, they just cheapen and streamline the manufacturing process by using different Ends instead of changing the bars themselves.
So, 1 factory, 3 bar lengths, and then 2-3 types of ends. Mix and Match as ordered.
I have 500 lbs of plates of standard 1" stuff that I've accrued for $200 or so, and with these bars, I don't need to invest in the Olympic prices since my heaviest lift ever was a DL for 365x3. If I hit 500 I'll be pretty damn happy.