[imardmd1]

When (how) did it get there?

The Mercy Seat fabricated under Moses' supervision was only a copy, a simulacrum, an earthly representation of that Permanent one in Heaven which pre-existed the one on earth. Wherever the earthly one is now is of no consequence, for that old system is quite fully wiped out and replaced by the Second, New Will/Testament/Covenant of God, with the True Mercy Seat firmly located in Heaven, as it always was, is, and always will be.

Hebrews 8:4-6 (AV):

4 For if he^Jesus were on earth, he should not be a priest, seeing that there are priests that offer gifts according to the law:
5 Who serve unto the example and shadow of heavenly things, as Moses was admonished of God
when he was about to make the tabernacle: for,

See, saith he, that thou make all things according to the pattern shewed to thee in the mount.

6 But now hath he^Jesus obtained a more excellent ministry, by how much also he is
the mediator of a better covenant, which was established upon better promises.

The True Mercy Seat of Heaven didn't "get there." It was always there, of which the earthly one was only a temporary copy of, for God's purposes with mankind in this realm.

[Mark17]

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[Elsie]

See, saith he, that thou make all things according to the pattern shewed to thee in the mount.

I've made patterns of many projects I've built over the years; but the final product was the only result. The 'pattern' only existed in my mind first, and on paper later. Then the object got built.

---

1 Corinthians 2:9

 

But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him.

 

 

I assume that 'prepared' means created beforehand.  Would that be close?