Fedora maintains 14 days of them (and that pruning is done after a successfull compose, so sometimes there's more when composes are failing, then it prunes down to 14 when one finishes).
That said, we don't have any control over download.eng.bos.redhat.com... thats someone internal syncing from us?
Metadata Update from @phsmoura: - Issue close_status updated to: It's all good - Issue status updated to: Closed (was: Open) - Issue tagged with: low-gain, low-trouble