Chips in carbon frame - how worried should I be?
These appear to be paint chips in areas of the bike where rock strikes are common.  I don't see any evidence of delamination--a separation of the carbon fiber weave and thus carbon fiber damage. However, no amount of photo inspection can replace a hands on one.  Were I to purchase a carbon fiber second hand, I would have a second opinion of the carbon fiber integrity done by my local bike shop or equivalent expert.
Paint chips can be covered with a similar colored nail polish or other suitable paint. There are many companies in the U.S. that offer carbon fiber frame repair if it is determined the actual carbon fiber is damaged and you already own the bike.