Stampwolf,
Showing what I have.
There are some that do not show the canx well due to the dark background color of the stamp. And unfortunately the Rodney/Fender ones are pretty poor.
Here's the Scott #s
row 1: 3658 on cover
row 2: 3632, 3636 x 4, 3645f
row 3: 3658, 3829A, 3833 x 3
row 4: 3836 x 2, 3872 x 2
And then a scan of a cover with Cat in the Hat canx. I have a few of these and they all seem to be on greeting card size envelopes.
I have larger scans of these if you want to look in more detail - let me know and I'll email to you.
Dave N.

