Hyphen in SalesForce Auto-numbering causing issues with saving in Box

SalesForce, since it's inception has the auto-numbering feature. Standard functionality for autonumbering of the "CONTRACT" object in SalesForce is utilized universally and is an important feature. As part of this auto-numbering, the "Contract ID" is generated as "C-00000001" (C followed by a hyphen and then the auto-number). We have been informed that this "hyphen" is causing Nintex DocGen to NOT ABLE TO SAVE the document in the contract sub-directory in Box. This needs to be addressed so the hyphen is no longer an issue to save documents to a Box sub-directory on Box.