Got the car back last night, no other issues found. They replaced the oil pan gasket, the oil level sensor seal and the bolts. Will keep fingers crossed it was really something that small.
Also interesting to note that the BMW procedure for this calls for them to reuse the oil they drained to drop the oil pan. They knew I was doing an oil change when I found the leak so the dealership offered to change the oil for just the price of parts (which I already paid for)
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