That's the form, upper right hand corner says TM 30 in Thai.

And Phuket is being very serious about it, if you leave the island, when you come back you have to report.

I should add one more observation. There were numerous foreigners in there, some were bitching about this, or that, or whatever.

The Thai staff were all friendly and smiling. Even when they were dealing with a difficult foreigner, you know the ones that give foreigners a bad name, they just quietly proceeded with the task at hand.

It was a very pleasant experience, not factoring in the waiting time, except for the few annoying foreigners that I had to tune out.

I had no TM.30 receipt in my passport, but I had a letter from the hotel I've been staying at on official letterhead, (one of the larger hotels), and they didn't question anything, they didn't look at anything else, once they saw the letter they just quickly processed my form, assuming the hotel did their part.

And there are Thai officials that read stuff posted in English.

See page 5 of this document

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This was the stamp they put in mine, no fine, no issues at the airport on the way out.

And over 7 days?

So what is the penalty for missing the 90 day report?

You should contact the Embasy/consulate you intend to apply at to determine their exact requirements. They all have different rules.