My thinking too. But I'm trying to recall anywhere ONSCREEN that implies or states that Boba's ship is Jango's ship. So assuming they don't salvage the ship (which I can see happening, but would write off as predictable), Boba could always buy a another ship of the same class.
I don't think it is mentioned anywhere onscreen (i.e. CANON) that Jango's ship (Slave I) is Boba's but according to Wikipedia (using EU sources) Boba continued to use Slave 1 well into the LOTF-era although he apparently also used other "Slave" ships when Slave-1 was damaged or temporarily lost for one reason or another.
http://starwars.wikia.com/wiki/Slave_1
Given that most of the information provided by Wikipedia on this matter is based on EU sourcing, it's difficult to determine what information will be ultimately (re-)written into official GL-approved canon but I imagine, however, that, what we have seen is the one and only Slave-1 that Boba continues to possess in TESB and beyond.