I just checked my keychain, and I have 33 entries for "iMessage Signing Key" and another 33 entries for "iMessage Encryption Key" despite NEVER opening Messages.app. Should I be worried? Can I delete them without causing problems? Edit: Just tried first aid and got this warning: Keychain can't be unlocked automatically. Please attempt to unlock [redacted] from Keychain Access. Even though the keychain was already unlocked before trying first aid (yet somehow locked partway through).