There are two websites that can show removed posts (by mods) and deleted posts (by users) on Reddit.
These websites are:
Note: not all removed and deleted posts can be recovered using these websites.
How to…
The easiest way of using these websites is by adjusting the URL of a thread or post. Replace reddit.com with removeddit.com or ceddit.com.
Reddit URL:
https://www.reddit.com/r/stopadvertising/comments/8x5dc3/spez_refuses_to_ban_hate_speech_yet_again/.
removeddit.com:
https://www.removeddit.com/r/stopadvertising/comments/8x5dc3/spez_refuses_to_ban_hate_speech_yet_again/.
ceddit.com:
https://www.ceddit.com/r/stopadvertising/comments/8x5dc3/spez_refuses_to_ban_hate_speech_yet_again/.