Final answer:
Alexis, known as Maria Macapa in the text, stole non-cohesive gold from the dentist's 'Parlors' and not items from a gas station.
Step-by-step explanation:
According to the excerpts provided, Alexis, referred to as Maria Macapa in the text, stole from the dentist's 'Parlors' rather than a gas station. The most valuable steal she made was one of McTeague's 'tapes' of non-cohesive gold, which she believed to be worth at least a couple of dollars. The narrative does not specifically mention a gas station but talks about an individual who has committed theft by taking the non-cohesive gold and other goods previously from a store.