If your Les Paul was made in 1952 thru 1960 or some SG's to 1963 it has Braz.
Then Braz was discontinued until:
2001: there was a run of Brazilian R9s in the range 91203-91250 (91201 and 91202 only come up as Les Paul Classics for me). within this range, the following numbers do NOT have Brazilian Rosewood according to my info: 91236, 91230, 91220, 91217, 91215, 91214, 91210, 91209, 91207, 91206.
Also, 911007 comes up as an R9 with brazilian.
2002: 8 R9s, in the range 92038-92045
2003:
1954 Reissue, ranging from 43001-43150
-within this range of numbers, 37 are '54 Black Beautys
-43001-43006 are 1-pickup '54 Goldtops that went to Dave's Guitar in WI. i am assuming these got BR
1956 Reissue, ranging from 63001-63148
-the only exception here is that number 63126 does not exist as far as i can tell
1957 Reissue, ranging from 73010-73707
-numbers below 73010 either have 2002 specs (73001, 73005, 73006, 73007), are prototypes (R7:73004; LP Junior: 73002, 73003) or do not exist
-within this range, 231 are 2 or 3 pickup '57 Black Beautys
-26 are LP Juniors
-73431-73438 do not exist
1958 Reissue, ranging from 83001-83256
-83001-83008 are prototypes (83001-83004, 83007, 83008), and 2 of these are LP Juniors (83005, 83006). 83009 is a quilt top R8 that went to Guitar Center
-within this range 29 are LP Juniors
-1 is a korina explorer
-83046, 83047, and 83087 do not exist
1959 Reissue, ranging from 93001-93674
-93001-93006 are prototypes
-93008 has 2002 specs
-3 are korina Flying Vs
1960 Reissue, ranging from 03001-03163
-03001-03010 are prototypes (except for 03007 (not a proto) and 03002 (2002 specs)), and 2 of these are LP Specials
-it appears that 03007 DOES have BR
-within this range, 21 are LP Specials
-48 are non-Historic GC '60 LPs, none of which have BR
Gary Rossington SG
-13001-13075 have Brazilian Rosewood
Gibson, either intentionally or by accident, built a few Historic Les Pauls with BRW well after 2003. I own a 2007 Yamano that has a BRW board & I am sure I am not the only one, albeit is unverified.
There was also a run in 1999 of about 25 guitars (40th anniv) that went to Yamano. Gibson verified one of them as braz last year - it was for sale on ebay. I don't know why that run is not on Gibson's web site.
Verification is all that matters. Most dark Brazilian looking boards are Madagascar.