Lunar New Year 2021 Die Cut 13.4 Stamps - Hidden 2021

This may be trivial to some if you, but according to the Unitrade Catalogue 2022..the 2021 issue of the previous years Lunar stamps, in this case the 13.4 die cut ones, have a hidden 2021. Out of the 12 in the set, I have found 7. Can anyone tell me where it is on 3262, 3264, 3265, 3266 and 3270 where it is. I'm using a digital microscope but still cannot find it.
Like I said, this may not appeal to many of you.

I cannot believe how long it took me to relocate this thread since I did not save or subscribe to it.
Anyway I spent about 15 minutes with a good bright light and a 10x lens and sucessfully located all the date locations on the pane of 12. I think the booklet would be similar. They are circled in yellow in my image of the pane.
Mike

Many thanks……i'd already been emailed privately the same as you have pointed out a couple days after I posted it.
But thank you anyway..much obliged.

No problem. Really tests the eyes for small nuances.