Now! Let us reconstruct some of the steps.....
1. Two curtain rods marked with the digits 2-7-5 and 2-7-6 are found in the Depository at some point after the assassination. The employee who finds them likely takes note of their appearance and of the markings, and likely mentions the discovery to several colleagues
2. The employee civic-mindedly brings the find to the attention of the 'investigating' authorities, who promise to look into the matter thoroughly
3. On the morning of 15 March the two rods are submitted to the Crime Lab by Agent Howlett for testing for Mr Oswald's fingerprints. Agent Howlett emerges with a B/W copy of the sign-in sheet that looks like this (alterations=erasures in the below image by
me, A.F.):
4. Nine days later, Agent Howlett returns and the two rods are released back to him. He emerges with a copy of the form that now has had release details added:
5. This, however, is NOT the version of the form that will go into public evidence in the WC volumes. What the public will see will be this, with a different sign-out date, newly written (though identical) time and new signature from Lt. Day:
This new version has been created using not the (colored ink) original but a copy made 3/15/64. Here once again is what THAT copy would have looked like: