While the future tense may be used in a wide variety of ways, I have yet to find a grammar that mentions what in English we refer to as “future perfect tense”. This may well be an oversight of mine, so if anyone does find such a reference, please let me know.
In any case, I have come across one passage that is an example of future perfect tense in Pali. It’s in MN 81. The Buddha smiles at a certain place, and on being questioned by Ānanda, reveals that the Buddha Kassapa in a past age had sat on this spot. Ānanda invites the Buddha to sit down, saying:
Ayaṃ bhūmipadeso dvīhi arahantehi sammāsambuddhehi paribhutto bhavissatī
Then this piece of land will have been occupied by two perfected ones, fully awakened Buddhas.
The use of future tense in combination with the past participle in context must function as a future perfect tense.
I am sure you will sleep much easier knowing this. You’re welcome!