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

Unsolved homicide from 1988 in Polk County, IA. The file remains open and contributors are re-examining the witness timeline.
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Body discovered near Lakeshore; the county opens a homicide investigation.
Initial canvass closes without a named suspect; the case goes inactive.
Records are digitised and released under a public records request.
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?
A retired deputy's field notebook, released last year, names a person of interest absent from the official file.
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