The evidence inventory lists a fibre sample that does not appear in any lab report. Where did it go?

Unsolved homicide from 1965 in Norfolk City, VA. The file remains open and contributors are re-examining the witness timeline.
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Body discovered near Sable Creek; the county opens a homicide investigation.
Initial canvass closes without a named suspect; the case goes inactive.
A retired detective releases his field notes to the family.
Ledger contributors reopen the evidence inventory and index the public record.
The evidence inventory lists a fibre sample that does not appear in any lab report. Where did it go?
Nobody ever pulled the impound log for the second vehicle named in the neighbour's statement. It is a public record and still available.
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