I'm trying to get the contents in the wastebin, but can't seem to get it working. This is the query I used:

List<HierarchicalContent> deleted = WAFContext.Session.Query<HierarchicalContent>()
                        .Where(AqlHierarchicalContent.IsRevisionDeleted == true | AqlHierarchicalContent.IsNodeDeleted == true)
                        .Execute(number);

Can anyone see what I'm doing wrong here?

Not sure why IsNodeDeleted isn't picked up, but this should work:

List<HierarchicalContent> deleted = new List<HierarchicalContent>();
var q = WAFContext.Session.CreateQuery();        
var hcAlias = new AqlAliasHierarchicalContent();
var res = q.Select<HierarchicalContent>(hcAlias);
hcAlias.IncludeOnlyDeletedNodes = true;
q.From(hcAlias);
var rs = q.Execute();
while (rs.Read()) deleted.Add(res.Value);

That worked perfectly :)

And thanks for the explanation Ole!