Boe 345 mailing address

I believe you are referring to the Bureau of Engraving and Printing (BEP), which is responsible for printing US currency and other government securities. The mailing address for the BEP is:

Bureau of Engraving and Printing 14th and C Streets SW Washington, DC 20228-0001

Please note that this is a government agency and not a private company, so you may not be able to send mail to a specific individual or department. If you have a specific inquiry or request, you may want to visit the BEP's website or contact them through their official channels.