Maybe I am not understanding what you mean but I was not aware that there were any old style maps left..all of my maps got converted to the new style.
No, this is incorrect. The Devs stated they were going to convert the old maps to the new style in 30 day intervals, and that if they were de-coded they would reset to coded again; but whilst some were converted 30 days after the patch, after that they appear to have not continued to do so, and any map that was in the old style and on THB co-ordinates remains so to this date. This is true even if they haven't yet been decoded; if they
spawned before the TMap changes, they will decode to one of the old fixed spots.
I have slowly been working through my collection of over 200 maps, divided into pre and post patch, and everything after the patch was indeed randomized; but decoding more Level 5s and 6s this week they remain on THB spots. Level 7s however will always be random as they were only introduced with High Seas, and didn't exist before the relevant publish.