Delta ticket price lowered

Just noticed that a Ticket I bought for 10-18-2013 for 707 is now going for under 650.
I looked at the Best price policy and it only good for 24 hours?

So should I want and see if it goes down more or ask for a price match?

Billing and Ticketing Information

FARE DETAILS: BOS DL X/NYC DL LAX165.58XA14A0NP DL SAN109.76VD21A0NQ DL X/ATL DL BOS338.60KA07AXNP USD613.94END ZP BOSJFKLAXSANATL XF BOS4.5JFK4.5SAN4.5ATL4.5


Fare: 613.94 USD
Taxes/Carrier-Imposed Fees: 93.56
Total: 707.50 USD

New price Total balance due:
$638.50 (USD)