This was noticed without my loupe. It's quite large. Honestly, I haven't come across a die chip this large.
It may be large enough to be considered an interior die break (IDB). The 2003 listed here is mine. http://cuds-on-coins.com/lincoln-cent-idb-1959-2008/ There isn't a listing for a 2005. You might want to contact them to see if they want to list it. Here is the link to the "contact us" page: http://cuds-on-coins.com/contact-2/
I just looked at that site and you might be correct. I sent a message about the inquiry. Mine does look like the ones posted there.