Fancy pen
On the night of 14 Thelliea, the party broke into the Valiant Morgen Trading Company Kaarst Branch with the accompaniment of Orianna. Down the first corridor from the building's rear exit, Mira stuck his head into one of the four doors and swiped a fancy pen. When he returned, the rest of the party questioned him about anything he'd taken, to which Orianna shakes her head in dismay.
Vastren
The next evening, the party defeated the Knives of Mystra and the bone devil underneath Kaarst. Afterwards, Mira and Grokko went to Vastren in the catacomb beneath the Spire of Conjuration, ostensibly to get more information from her about what she had talked to the Knives of Mystra about.
After negotiation, they came to a deal with Vastren that she would tell them everything that she had done for Etorn Hadaran, then they would release her from her magical bindings, then she would provide a token of appreciation to Mira and immediately depart to Nessus. Furthermore, if she was not released within one minute of providing her information, or if any hostile action was taken after she was freed, then the deal would become null and void, and she would be free to slay them both and take their souls.
Once Mira and Grokko were sure she was not lying to them, they agreed to the deal, and in front of each of them appeared a parchment scroll in a small burst of flame. Mira used his fancy pen and red ink stolen from Valiant Morgen to sign the scroll, then lent his pen to Grokko to do the same. Their signatures singed on the documents, which then curled up and disappeared in a puff of fire. Mira took back his fancy pen.