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What kind of Owners are for example §OPTOUT:11521579§ ?
Opt - out - Someone who has chosen to hide their stats or had "selected to opt out of third party vendors" on geocaching.com.
q.v. https://project-gc.com/qa/?qa=23438/why-is-this-optout-c49eef81-text-in-my-finds-by-owner-stats&show=23478#c23478
and
https://project-gc.com/qa/?qa=20005/favorite-point-changes-optout-is-this-an-error&show=20005#q20005
