is there a way to convert a list of sobjects into a string?  I don't really care about the format, just that the field values can be string searched. Something like this:

List<sobject> pparcels = database.query('select ...');
String relatedMatches = pparcels.toString(); //toString doesn't exist
if (relatedMatches.indexOf(affectedIds[i]) > -1) {
...
}