Is anyone able to shed any light on what consequences may be faced for returning to Thailand to work after leaving in 2018 and not cancelling the extension of stay at that time (employment) and doing a land border bounce instead and then leaving via the airport within the 30 day visa exemption timeframe.

It's not known if the work permit was ever cancelled by the company but that info could be found out if needed.

I guess there could be a fine involved as there's a very old post here stating that. Are there any other issues likely to be faced and is there anything that can be done to resolve them before going to chaeng watthana for a new extension of stay later down the road such as going to labour dept to check/update the wp record?

Thanks for any help