Update "last checkin" field even if item wasn't checked out
Update the "last checkin" field every time an item is checked in. Now, when you check in an item, the "last checkin" field is not updated if the item is not checked out. I don't know of any reason to not update it. When I look at an item record, I want to know the last date that the item was seen; this can be useful in tracking down items that seem to be missing, or coming up with a list of items that might be missing.

This idea will be reviewed for consideration as an enhancement in an upcoming release.
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Shawn P. Farrell commented
On a related note, I would like to see the timestamp of the last checkin added, as it also appears for the last check out date field.
Use Case: While I'm sure there are any number of reasons to display this data, at the the moment, we have a security-related matter at one of our branches where the timing of a transaction would be useful in addressing it.