help with 81 cobra decode

[ttopmustangs]

the door tag has a piece stuck over the date, looks to me like they changed the date?

[ttopmustangs]

sorry forgot the pics

buck tag
mustang
212083 61R D TR 0573
9D TT DF ST
05 RA HB
CBR D7 V
-B
it also has a big S and a backwards 2 with a S looks to be stamped after the other #

[ttopmustangs]

my brain is not workin , heres the door tag

[FoxChassis]

VIN
1FA = USA, Ford
B = manual seatbelts, no airbags
P = passenger car
15 = Mustang three-door sedan
D = 4.2L V8 engine
9 = VIN check digit
B = 1981 model year
F = Dearborn Assembly (DAP)
212083 = 12,083rd 1981 Mustang assigned a VIN at DAP

Buck Tag
MUSTANG = model line
212083 = 12,083rd 1981 Mustang assigned a VIN at DAP
61R = Mustang three-door sedan
D = 4.2L V8 engine
TR = T-roof
0573
9D = White exterior paint color
TT = lower tu-tone
DF
ST
05
RA = lower bodyside protection
HB = rear defrost
CBR = Cobra package
07 = full-length rear facing hood 'scoop'
V = light group
-B = Blue interior trim color

VC Label
DATE - 05/81 = May 1981 scheduled build date
EXTERIOR PAINT COLORS - 9D 1C = White w/ Black lower
DSO - B6 = Ford of Canada - Western region district sales office
BODY - 61R = Mustang three-door sedan
VR - [blank] = no vinyl or carriage roof (not available on three-door sedan)
MLDG - [blank] = no special bodyside moulding or insert
INT TRIM - BBD = high-back cloth & vinyl front bucket seats, Wedgewood Blue interior trim color
A/C - [blank] = no factory air conditioner
R - 7 = AM/FM stereo cassette radio
S - D = T-roof
AX - G = 2.26:1 axle ratio w/ conventional (non-locking) differential
TR - W = C4 transmission
KK = E0BZ-5310-R front coil springs
MM = D9BZ-5560-P rear coil springs