Why no d10 in BECMI Basic?

Okay, short post here. But these trivial questions do come up every so often, and then disappear because they're really not that important.

Now, the d10 is mentioned on the page (explaining how '0' is read as '10' and how to read two d10s as a percentile roll) but the picture of all the dice on the same page doesn't have it.

Why? I guess it's just one of those mysteries that we'll never figure out, but have fun theorizing about.

I'm thinking aliens did it. Or ancient Mayans.