Mirage Speakers?

Craigslist find here...not much out there on these.

2 Mirage 460 speakers
1 Mirage MC-4 center channel speaker
2 Boston Acoustics CRX dipole rear surrounds
Marantz SR-73 receiver

$350

What do I make of this system?

From what I can gather the Mirage 460 are 2-way speakers but not much info. Not much info on the MC-4 and virtually none on the Boston Acoustics?

And the Marantz receiver?