Section 6
SEC. 6. The blank form required by section five to be forwarded to each known claimant shall be accompanied by a notice that the statement therein called for must be presented within thirty days from the receipt of said notice. The failure of any claimant to make such sworn statement within six months after notice shall, upon the complaint of the Director of Public Works, work a forfeiture of the claim: Provided, however, That the Secretary of Commerce and Police may, for sufficient cause in his discretion, extend the time limit within which the statement may be filed for a period not exceeding six months.