Het leopard definitely has visual markers, to the point that some people argue that the gene is actually an incomplete dominant. Here's some pics of my hypo het leopard Sonoran that may be of use for the next bit:
I've heard "bow tie saddles" being thrown around as an indicator, though I think "aberrant saddles" would be a better term. I've seen some known het leopard boas with otherwise regularly spaced, pinched-in "bow tie" saddles, while others have more funky-shaped floating saddles (ie. my Sonoran). The saddle markers can be easily masked by genes such as jungle, motley, or any other gene that tends to modify saddle pattern, though.
Another thing to look at is the headspear. Het leopard boas tend to have abberant headspears, sometimes to the point that they look like a full leopard's. Arrow-shaped headspears seem to crop up a lot. "Whiskers" and other beauty markings seem to as well.
An extra bit of blushing around the face may also be a het leopard indicator. The leopard gene tends to introduce an extra bit of red, and you can sometimes see this in the hets.
Good luck distinguishing your hets! I'm not a breeder myself (just a Sonoran enthusiast who's looking into it), so you'll definitely want a second opinion, specifically re: how leopard interacts with other genes. For what it's worth, I looked over your update thread from yesterday, and I think the albino in the second-to-last picture is a good contender for het leopard.
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