I will try to keep this list updated as I come across new agency door tags that confirm their respective paint codes from each year. Texas DPS has been added to the 1989 and 1990 lists.
To add even more info to this thread, here are the actual paint names (and sometimes also the regular production paint code) for the above 'special paint' codes...
1989
W0046 and M1724 = White and (1C) Black
W1677 and M1724 = Cream and (1C) Black
M6062 and M5979 = (1K) Light Grey and (7H) Bright Regatta Blue
W8141 and M6188 = Blue and (7N) Deep Shadow blue
W2813 and M6062 = Grey and (1K) Light Grey
1990
W0046 and M1724 = White and (YC) Black
W1677 and M1724 = Cream and (YC) Black
W2007 and M6383 = Grey and (MM) Ultra Blue
W2813 and M1724 = Grey and (YC) Black
W2813 and M6330 = Grey and (YF) Light Titanium
1991
W1677 and M1724 = Cream and (UA) Black
W2007 and M6383 = Grey and (MM) Ultra Blue
W2813 and M6401 = Grey and (YX) Titanium Frost
1992
W0046 and M1724 = White and (UA) Black
W1677 and M1724 = Cream and (UA) Black
W1677 and M6373 = Cream and (UA) Black
W2007 and M6383 = Grey and (MM) Ultra Blue
W2007 and M6290 = Grey and (MK) Twilight Blue
W2813 and M6401 = Grey and (YX) Titanium Frost
W8141 and M6290 = Blue and (MK) Twilight Blue
1993
M6547 and M6373 = (WB) Vibrant White and (UA) Black
W1677 and M6373 = Cream and (UA) Black
W0046 and M6373 = White and (UA) Black