And then, we have the document number, 181, which like the index number, 823, can be checked against the 'other' consecutively numbered documents (179, 180 / 182, 183), and indexed (821, 822 / 824, 825), so that its place in order of date and time can be pinpointed accurately, thereby, confirming that on this particular date and time, that cops still had possession of the '2nd' silencer, at a time when the '1st' silencer was already at the lab'...
'Two' silencers then, 'not' only one...