https://img1.od-cdn.com/ImageType-100/2861-1/%7B607580A2-6E38-4A6E-8F62-715EE3FB294D%7DImg100.jpg is a working Overdrive cover image.

On June 4, 2018, this cover image was mirrored to https://covers.nypl.org/Overdrive/Overdrive+ID/607580a2-6e38-4a6e-8f62-715ee3fb294d/%257B607580A2-6E38-4A6E-8F62-715EE3FB294D%257DImg100.jpg , but something went wrong. The document found on S3 has the right media type but it's empty – 0 bytes.

https://covers.nypl.org/scaled/300/Overdrive/Overdrive+ID/607580a2-6e38-4a6e-8f62-715ee3fb294d/%257B607580A2-6E38-4A6E-8F62-715EE3FB294D%257DImg100.png is the thumbnail of this image. It also has the right media type but it's empty.

It's not clear how many book covers have this problem. In the worst case we may have to check all of the cover images currently hosted in the covers.nypl.org bucket.