Coded letter

From CFG

Coded Letter

Found

On June 14 Marcus posted the files he got from Pexbox. It contains a letter with ciphers and 4 sound files:

• File:Pb.pdf
• File:Red bb+1+14+12+17+7+2+0+3.mp3
• File:Green
• File:Yellow
• File:Blue -4+9-6+16+1+7-3-4+3.mp3