In LVVA, fond 7349, op. 2, vol. 73-76 is preserved a considerable amount of material concerning the Swedish embassy to Moscow in 1674. Among the more odd items is a fragment of a letter book (June-July 1673) which once belonged to Gustaf Oxenstierna, the leader of the Swedish delegation. It contains information about the preparations for the journey, for instance the hiring of a translator and the purchase of presents. In vol. 76 there is a specification of how many horses and wagons the delegation needed. Count Oxenstierna should have 20 wagons, while his two colleagues would have to do with 15. The total number required was 169 - along with 148 horses (for riding). A curious item in the same volume is an unsigned and undated diatribe against the Russians, "this barbaric nation which does not care for reason or agreements".
The volumes also contains a number of letters from Gustaf Oxenstierna and other members of the delegation to Governor General Tott and Governor Fersen in Riga. Some of the letters are coded, but luckily there is a key in vol. 74.