The Haunting of the South Creek Post Office

The other day, I was needing to go the post office to mail some invitations. I brought along my son's girlfriend, who was helping me prepare the invitations. It was around 8 at night on a Saturday, so naturally, the place was empty. One man was at the automatic mailing station. As N and I stood waiting our turn, the automatic doors opened and closed. No one was there. We thought nothing of it--a simple glitch.

The man at the kiosk left and we stepped up to take our turn. A minute later, the doors opened and closed again. We looked at each other, eyebrows raised in surprise. Again, no one was there. We finished our purchase and turned to the table to begin affixing the stamps.

We were nearly halfway through when the door opened and closed again. No one there. N and I began stamping faster. A minute later, I looked up when I went to grab another card and out of the corner of my eye, I saw a figure. It was a young woman with long brown hair.

Mind, the doors hadn't let anyone in when it had opened before. And as I watched, she passed between N & the door toward the back of the post office and just...disappeared. I told N and we finished the last invitations. As we stamped the last one, the doors opened and closed again and then they opened to admit a middle-aged woman with short blonde hair. N & I ran out the door, leaving her to her fate.

I'd say we were cowards, but for two facts:

A) She likely wouldn't have believed us if she even understood us (English is not spoken by everyone here).
B) She walked out before N & I got to the car.

Needless to say, I won't be going back to that post office after hours. Unless I want to encounter the ghost. How about you? If you saw something that couldn't be, would you believe it or would you find some other explanation, no matter how far-fetched? If you saw a ghost, would you go back to try to find it again or avoid the situation that led to the sighting?