chances are it’s just an fdxa tag why else would they include pet chip in the article
There are FDX-A chips out there that are T5577 chips
they’re not really t5577 and don’t behave as such and are basically dud
Well shit…
Now I need to find some that are actually t5577
edit-
Contacted seller, they are claiming it IS a T5577, but will only work with a fdx reader 
How many do you need?
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2-5
I found a eBay listing I can go with unless you have a few you want to part with