SSID Does Not Exist

In the following example, resource identifiers 0-3 exist, but the specified identifier, 4, does not exist:

$ sstore list //:class.cpu//:res.id/4
Warning (//:class.cpu//:res.id/4) - lookup error: no matches found
$ sstore list //:class.cpu//:res.id/*
IDENTIFIER
//:class.cpu//:res.id/0
//:class.cpu//:res.id/1
//:class.cpu//:res.id/2
//:class.cpu//:res.id/3