look at the full email address header to see where the email was sent from on the second chance offer.
if it comes from an address second-chance-ebay.com, or any address other than eby.com, it is a scam, as someone saw that you bid on a high priced item, and wants to scam you into thinking that it is available.
if it is from xxx.ebay.com - it has to be from ---.ebay.com, then it may be legit, and if you check the original offer page or your profile, you should see something that says you have an offer open.
if it is a scam, they will want you to email someone with an email adress other than the original seller of the item, and that is not registared on ebay, to accept the offer
then the offer will want you to send money order/cashier check/ western union to someplace.
then you will not see the item.
the email looks official, but the second-chance-ebay.com domain name is registared to someone in chicago.
you can try to send the information containing the full header to something like spoof or
[email protected] or something like that and they will verify the email for you - you'll need to look it up. if it is real, then if you want the item, is probably safe.
i bid on a NV item, got a second chance email, tried to complain to ebay, they didn't seem too interested in the complaint. i guess i may need to send info to the federal internet fraud link.