Hi Yong Yong3, u went after sat or after? Usually if same day should be available unless too high in demand or nit many eggs were returned..
next time when u reached the temple after knowing that successful parents return the eggs, u may wish to ask the temple assistant if the eggs r still available bcos it happened to me once. I saw it myself. Because many eggs were returned the assistant there (or someone) fearing that no one collect the eggs has kept it away and given them away. I don't want to mention which temple but I think not v nice to do it this way, moreover the parents just returned the eggs not long ago when I reached. Maybe also because many times red eggs were returned and no one collect.
Just try asking, u may get your blessing eggs