I realize it is a very cozy tradition of man to believe the ark of the covenant (testimony) is on earth somewhere. There is no reason to put quotation marks around the word ark in Rev. 11:19 as you did - it the WORD of GOD, not my presupposition. The only logical way for the ark to be in heaven would have been for Elijah to have it in his possession when he was taken to heaven. But no matter how it got there, the fact is, it's there.
The ark I am talking about was the one in Solomon's temple:
2Chro. 5:10 There was nothing in the ark save the two tables which Moses put therein at Horeb, when the LORD made a covenant with the children of Israel, when they came out of Egypt.
That's the same one that's in the Temple in Heaven now. How do we know? There is only ONE Ark of HIS Testimony. It goes before HIS people into battle. Hence, it is only brought out at the 7th Trumpet when JESUS Returns.
See Joshua (YASHUA/JESUS) 6:8-9
And it came to pass, when Joshua had spoken unto the people, that the seven priests bearing the seven trumpets of rams' horns passed on before the LORD, and blew with the trumpets: and the ark of the covenant of the LORD followed them. And the armed men went before the priests that blew with the trumpets, and the rereward came after the ark, the priests going on, and blowing with the trumpets.