No disrespect
@Marie ********
but this sounds like a slow motion train wreck.
I'd just come in on a 45 day free visa exempt entry THEN you can go to your holiday in Cambodia
AND when you come back that would give you time to deal with your employer actually getting the correct documents so you can apply in country for the 90 day non-B visa OR go to a thai consulate in a nearby country to apply.
Keep in mind that police report can only be so old when you apply SO a 15 year old one most likely isn't gonna cut it 😕 (but I can't find where it says how old is too old)