In the BS Machine, open your event → Export Load Pack. AirDrop that file to this phone, then load it here.
Open the AirDropped file (Quick Look), Select All, Copy, and paste it here — handy if the file picker is being fussy.
Only cash out of the drawer. Card purchases go through the normal flow.
AirDrop the saved file to your Mac, then in the BS Machine click Import Results File. Importing twice is safe — it won't double-count.