BigCommerce PROPFIND WebDAV double HTTP code

$ curl --request PROPFIND --insecure --dump-header head.txt --digest --user [email protected]:ABCDEFG https://www.mystore.com/dav/exports/products-2016-03-17.csv
<?xml version="1.0" encoding="utf-8"?>
<d:error xmlns:d="DAV:" xmlns:s="http://sabredav.org/ns">
  <s:exception>Sabre\DAV\Exception\NotFound</s:exception>
  <s:message>File with name asset://file/ftp_root/exports/products-2016-03-17.csv could not be located</s:message>
</d:error>



$ cat head.txt
HTTP/1.1 401 Unauthorized
Server: nginx
Date: Thu, 17 Mar 2016 03:45:27 GMT
Content-Type: application/xml; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: fornax_anonymousId=920a45aa-d71c-4a86-8fa2-85999b123456; expires=Tue, 13-Sep-2016 03:45:27 GMT; path=/; domain=.me.com
WWW-Authenticate: Digest realm="BigCommerce",qop="auth",nonce="56ea285712345",opaque="df58bdff8cf60599c939187d0123456"

HTTP/1.1 404 Not Found
Server: nginx
Date: Thu, 17 Mar 2016 03:45:27 GMT
Content-Type: application/xml; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Set-Cookie: fornax_anonymousId=a32ec598-2569-402a-a712-651123456789; expires=Tue, 13-Sep-2016 03:45:27 GMT; path=/; domain=.me.com
Vary: Brief,Prefer
DAV: 1, 3, extended-mkcol, 2


# NOTE: THE HEAD REQUEST BELOW RETURNS THE SAME RESULT
$ curl --head --insecure --digest --user [email protected]:abcdef https://www.mystore.com/dav/exports/products-2016-03-17.csv