Overstay and the Thailand Elite Visa Program

Hi.
I have applied for a 20yearmembership.
But now have some concerns that, that even if approved, and pay the membership fee,
that I will not get any the visa, due to previous overstays
I learned that this can happen, from this video from Integrity Legal Thailand

I know that I did previously have 1 day overstay,
but I can not remember if I might actually had another 1 days overstay a few years ago.
I wish to avoid the risk of paying for the membership, but without getting the visa.
Is there any way to look up my over-stay record ?
( I have looked through my current and old passports, and found no overstay stamps )
Or would it be wise to contact the Thailand Elite Program,
and ask them to only approve the application, if the Visa will be granted ?
Thank You for any advice.
Best regards.