My bad ! I looked at them a little closer and they are NOT NYS tabs after all - close, but no cigar, Sorry, wasn't trying to mislead you.
I looked through one of my reference books on license plates, "License Plates of the United States" by James K. Fox, and found only one state, Michigan, had tags of that shape. The book only shows passenger car plates, not other types (i.e. commercial, taxi, bus, etc.).
According to the book, passenger car plate tags for 1960 were Yellow with red numbers, 1961 white w/ red numbers; 1963 green w/ white numbers and 1964 were black w/ yellow numbers. The tags you have appear to have original paint, so I suspect the ones where the color isn't correct (according to the book), may have been for non-passenger car vehicles.
Hope this helps.
-Bob