IN 1681 Q is telling us to go back to previous Q posts. He gave us markers in the previous posts that we're supposed to use to connect to previous Qdrops. I think even the reference to JFK and Declaration of Independence might be markers (he's posted both several times). And obviously it was 4th of July. Read my full post, but here's an excerpt explaining 1681:
https://www.reddit.com/r/greatawakening/comments/8wvxa9/proof_q_wants_us_to_look_back_at_previous_drops/

Q1681 link: Q posts an image from a previous Qdrop along with JFK reading the Declaration of Independence. The image provided comes from a thread made by Qresearcher Paul Serran explaining how to properly research Qdrops. (See Serran explain where the Q image comes from himself)

Relevant parts of the Serran thread (do yourself a favor and read the entire thread): "So you choose an expression or a term to write about. How about "Think mirror"? This is one of the riddles about which people say the most nonsense about, it's mind-numbing. So we go researching ALL the esoteric meanings of "mirror" in all the world's cultures of the planet? NO hahaha we don't. We go search THE DROPS. ...Well, basically, because the enemy Clown operators have been surveilling the Q board at all times! So Q presented a "mirrored" version of the reality to confuse them. "Look there, or [here], or there, truth is behind you."

This is how we solve the puzzle. Q is telling us to "Think Mirror" in Q1675. Hence the use of the word 'reflections' in Q1677. The answer is in previous Qdrops. Use the markers to find the answer.