@Ivor *****
It's more of where are you bouncing out and back in at..
You wouldn't be asked for anything at Mae Sai, Mae Sot, Phu Nam Ron <- all borders with burma.
You have a high chance of being told you need to stay overnight in Cambodia at some of the border crossings with them and being asked for proof of funds.
You have a high chance of being asked for proof of funds at the southern border crossings.