I don't know how to tell you this but I don't think that male is a yellow belly. At least it's not like any I've ever seen. Yellow bellies can be hard to identify but once you get it, you can pick them out in a heart beat. Yellow bellys have 3 things I look for; belly pattern, flames, and a head spot. Here is a belly pic of mine and you can see the difference between her and yours.
And here's a top pic showing the head mark and flames.
The one you have has a fairly clean belly but it doesn't have a YB look to it. And by that pic you posted it doesn't seem to have the flames (white or yellow colour coming up the sides of the snake from the belly) that a yellow belly should have.
If you bought it as a YB, you may have been dooped. Sorry
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