If it hasn't been removed, the paint codes are inside on the rear fender.
If you remove the rear panel, look down and there's the paint codes label.
Here's a list I have for USA RC51 paint codes (red/silver).
Force Silver Metallic, Honda: NH411M, Color-Rite: 2992
Winning Red, Honda: R258, Color-Rite: Top coat:2530, Base coat: 1090
Frame & Wheel touch-up (13ml), Core Black Metallic, Honda: 08P50-NH377M
Winning Red touch-up (13ml), Honda: 08P50-R258
Force Silver Met. touch-up (13ml), Honda: 08P50-NH411M
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