I'm using project based authorisation.

The documentation on https://plugins.jenkins.io/shelve-project-plugin/ sais:
"Shelving a project requires the DELETE permission. Unshelving a project requires the CREATE permission"

I observed:
With the "shelve project" Action everythin is ok.

But: Non-administrator user do not see the navigation entry: "shelved projects", even if they have the create permission. Thus they cannot unpack their lately packed projects.

I would expect that non-adminstrative users could restore projects if the have CREATE permission as it is written in the documentation.

I think this is a side effect of issue "JENKINS-55462".
and this commit:
https://github.com/jenkinsci/shelve-project-plugin/commit/2cb2db06167ebe4b80075ad67cea0ee36b4e45ca#diff-98f696bcda8cb0891e558d0ad7ec5d575e5958be91f18490173b78ccbc74422a

As issue JENKINS-55462 does not mention that "unshelved projects" option should be restricted to administrator I guess this side effect was not intentionally.