All a little phishy

I meant to post this back when it happened a couple of weeks ago, but kept forgetting. Strange and slightly worrying phone conversation:

Me: Hello?
Switchboard: Hi, got a call for you from Alpha Deliveries
Me: Ok. Thanks.

Them: Hi this is Pete from Alpha Deliveries, and we've got a parcel here for you that's due to be delivered on Monday. It's registered post and weighs more than 4 kg, so we're going to need a signature.
Me: Ok...
Them: Can you confirm that you'll be in between 7am and 7pm?
Me: At work?
Them: Yes... your office is on Upper Richmond Road -
Me: Yeah. I won't be here all that time, no.
Them: Well, could you give us the name of someone else that'll be there so that we can make sure someone named signs for it. Otherwise we'll have to bring it back here.
Me: [name of co-worker]
Them: And is there another name, just to make sure that we can get it delivered?
Me: [name of another co-worker]
Them: And can you give me another name, just so we can definately make sure it gets signed for.
Me: (suspecting something is wrong and panicking slightly) Um, no, I don't think there's anyone else that'll be here.
Them: Ok, thank you.
Me: Ok...
Them: Bye.

I was concerned by the slightly strange request for so many names, and the fact that I hadn't ordered anything. Needless to say, nothing arrived on the Monday. So either it's the world's slowest delivery company, they got the name on the parcel wrong (possible, since there's another person in my office with my initials, and people have called the wrong one of us before), or it was someone trying to fish for information.

Had I been a little more awake (it was a Friday afternoon when they rang) and not trying to do two things at once (I was showing someone where something was on my computer at the same time), I hope I would have been a bit more guarded with what I told them. I hope also that I would have asked for the guy's name and the company name again. And possibly a contact number or order number.

As it is, I have no idea how they got my name and work number, since I don't even know my work number and certainly haven't written it down anywhere. The only place where my name and the name of the company I work for are together is on Facebook, which seems an unlikely source of information for whatever scam they're trying to pull.

I also don't know what they could do with the information they got from the call, the names of two other people who work for the company I work for. I don't really know what other information they might have hoped to get out of me, over the phone, either. Altogether, I don't think I gave much away, and if it was a scam attempt, I don't really see what they got out of it.