Just produce a new police report in the US. It doesn’t matter where you have been for the last two years. A police report doesn’t include your travel itinerary.
Getting a 1 year extension is easy. However you now want to prepare to meet the financial requirements. You have to decide whether you are going to use banked money or monthly income transfers.
You should talk to your bank about how to identify the money as coming from a foreign source. I talked to Kasikorn and they said they could provide a document. And of course talk to your immigration office.
My US address is my sister’s house. She has forwarded documents sent to me at that address. If you have a similar arrangement in the US then you could try mailing “from within the US” that way. It will cost a bit more and everything will take longer in the mail.
Open your passport to the visa page and tell them you have an O-A visa. I think there is a place on the arrival card to put the visa number as well. And check before you leave.